Effects of Familial Alzheimer's Disease Mutations on the Assembly of a β-Hairpin Peptide Derived from Aβ(16-36).

Effects of Familial Alzheimer's Disease Mutations on the Assembly of a β-Hairpin Peptide Derived from Aβ(16-36).
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DOI:
10.1021/acs.biochem.1c00664
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发表时间:
2022-03-15
期刊:
影响因子:
2.9
通讯作者:
Nowick, James S.
Nowick, James S.
中科院分区:
生物学3区
文献类型:
--
作者:
McKnelly, Kate J.;Kreutzer, Adam G.;Howitz, William J.;Haduong, Katelyn;Yoo, Stan;Hart, Candace;Nowick, James S.

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家族性阿尔茨海默病(FAD)与β-淀粉样肽(Aβ)或淀粉样前体蛋白(APP)的突变有关。将a β的FAD突变整合到一个模拟β发夹的大环肽中,研究FAD点突变K16N、A21G、E22Δ、E22G、E22Q、E22K和L34V及其对组装、膜不稳定和细胞毒性的影响。四种E22突变肽的x射线晶体结构显示,这些肽组装形成相同的紧密六聚体。SDS-PAGE实验显示突变的FAD肽以三聚体或六聚体的形式聚集,正电荷较大的肽以更稳定的六聚体聚集。增加正电荷的突变也增加了肽的细胞毒性和它们破坏脂质膜稳定的倾向。
Familial Alzheimer’s disease (FAD) is associated with mutations in the β-amyloid peptide (Aβ) or the amyloid precursor protein (APP). FAD mutations of Aβ were incorporated into a macrocyclic peptide that mimics a β-hairpin to study FAD point mutations K16N, A21G, E22Δ, E22G, E22Q, E22K, and L34V and their effect on assembly, membrane destabilization, and cytotoxicity. The X-ray crystallographic structures of the four E22 mutant peptides reveal that the peptides assemble to form the same compact hexamer. SDS-PAGE experiments reveal that the mutant FAD peptides assemble as trimers or hexamers, with peptides that have greater positive charge assembling as more stable hexamers. Mutations that increase the positive charge also increase the cytotoxicity of the peptides and their propensity to destabilize lipid membranes.
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发表时间: 2018-03-20
影响因子: 18.3
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